Method of drawing glass articles.



J. H.-LU BBERS. METHOD OF DRAWING GLASS ARTICLES.

APPLICATION FILED JAN. 10, 1906.

1,020,920, Patnted Mar. 19, 1912.

# UNITED STATES PATENT OFFICE.

JOHN H. mmsmzs, or ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO wmnow GLASS manna; OMPA Y, OF mr'rsnoaon, rnNNsYnvANm, A CORPORATIO on NEW JERSEY METHOD or DnawrNo olpass ARTICLES.

I 1,020,920. Specification ctne r n Patented Mar. 19,1912.

Original application filed May 21, 1903, Serlal ,No. 168,069. .Dlvlded and this application tiled laminar},

10, 1806. Serial No. 295,369. r

To all whom itinag/ concern: i haustor reliefio f asmall ortion of the air Be it known that I, JOHN H. LUBBERS,-a supplied to the interior the article diircitizen of the United States, residing at ing drawing, which may be done through a Allegheny, Allegheny county, Pennsylvania, small hole which is opened by the operator have invented anew and useful Method of after the forming of the cap so that aco n-i Drawing Glass Articles, of which the folstant opening isprovided through which the tlowing is a full, clear, and exact description, excess air is passed out as it becomes heatec reference being bad to the accompanying within the article. This has been found 'de-- drawings, forming part of this-specification, sirable, especially in connection withv a; 10 in whichgraduating valve b which the supply of Figure 1 is a vertical section showin the the air is controlle since the small outlet, 6D drawing of a. glass evlinder -in accor ance prevents the enlarging'of the article during. with my invention; Fig. 2 is an enlarged drawing, which-isotherwise liable to occur lvertical section of'the apparatus during the on account gf variations in pressure in the,

lfietir'st portion of the'drawing operationfand article;-

Fig. 3 1s a view similar to Fig. 1, showing In 'the' accompanying drawing I have Y0. thew'ithdrawal of the air si pply pipe after shown and described one form of apparatus the cylinder has been rawn to the desired suitable for" carrying out my invention,

- length. I which I will now describe, promising, how- My invention relates to a novel method ever, that various other forms of apparatus of drawing hollow glass articles, this ap may bec'm loyed. 7'5 plication being a division of my application In the rawings, 2 represents a double Serial No. 158,069, filed May 21st, 1903, and reversible pot into which the "hiss iuayxb' in accordance with whichthe interior of the ladledor; otherwise supplied, t iis pot being 26ghollow articleis chilled at or near the drawsupported upon, trunnionsfi, within the upingpoint, thereby enabling articles of per portion of a furnace 4, to which heat is 80 t lcker glass to be drawn than'where outsupplied through an eye 5. The pot is arside chilling is used, and also equalizing the ranged to be raised and lowered and to be heat of the molten bath of glass which is turned over so that after the drawing opera- 30*;inore liable to chill inits outer portions. tion it may be reversed and the heat used to The inside chilling also nables the glass to melt out the refuse glass. The pot may be 85' drawn'atgreater speed than formerl either of doubleform with holding cavities and is' of especial advantage where heat is in top and bottom, as shown, or of single.

- ap i lied to the bottom of the pot. form. This'arrangcment o f 0t and fur-.

he invention provides for chilling the mace is not claimed by me, it eing the im less by airor gaseous fluid which, is introvention'of Lincoln Thornburg.

uced' through the bait, the air bcin sup- I have shown the bait or drawin tool plied at the same level, or substantia ly the 6 as consisting of a blow-pi e of or inary 'samelevel with respect to that of the glass form, having a collar 7 whic is hung on'a 40 bath, throu bout the drawing operation. hook 8 supported on the drawing-frame 9. By thus app ying the air its effect in chilling The drawing frame is guided between veris substantially uniform throughout the tical supports 10, 10, being lifted by a wire drawing, and the chilling effect is much rope'll, or-by other suita le mechanism;

stronger than ,where the air is introduced t At an intermediate point of the blow pipe 45 through a central hole in the pot. is provided apet cook 12 by which a small The invention is further designed to pro amount of the air may be allowed to pass vide for withdrawing the hollow article and out during the drawing and after the cap the supplytube' from each other after the is formed. This pet cock is turned to 0 en drawin operation is completed, this being or partly 0 en the hole, after the cap as 60 prefera ly accomplished by drawing the been fOImCt ,it remaining open throughout supply tnbe upwardly out of the article the blowing operation. The blow pipe is "after the drawing of the glass article is provided with astutiing-box 13 in its top com lete'd. 5 through which extends the air supplyipe *g'l'l ie invention also, provides for the e':- 14, the lower end terminating near the evel molten glass an vent it from reaching the heads of the cyl-- inder or tube. 'The stationary air-supply pipe 17 enters through the top :head of 0 the cylinder 16, this tube being-provided with the usual graduating valve 18 havin a connection 19 by which it is slowly turne during the drawing operation, as described in my previous Patents, 7 02,013 and 702,014; granted on June 10, 1902. A high pressure air supply tube 20 enters the lower end oi the cylinder 16; this tube may be provided with a suitable hand controlled valve by which the operator may supply high pressure air' to or exhaust 1t from the cyllnder beneath the piston; In carrying out the drawing operation the parts are in the position shown in Fig.

2, the operator supplying suflicient. alr" through a hand valve at the working pulpit, and controlling. the pipe 17 to form the neck and then swell out the article to" form the ca of the desired size of the cylinder or article to be drawn. The pet cook 30 on the blow pipe is then opened, and the drawing of the article begins, and as the .article is drawn upwardly, air flows down through the upper cylinder and the supply pipe and emerges near the 'level of the out the drawing operation. The supply of air during the drawing is regulated y the graduating valve to hold the article at the same size as it is being drawn, the regula tion being assisted by allowing any excess air, which is expanded by the heat of the glass, topass out through the small pet cock, thus preventing an enlarging ofthe cylinder. After the article is drawn to the desired length,,high pressure air is admitted under the piston, and the supply-tube is .thereby forced up and withdrawn from the article and the blow-pipe, the parts taking the position shown in Fig.- 3. The blowpipe is then lifted ed the frame and lowered with the article to one side of the furnace.

The advantages of my invent-ion result from supplying air through the hollow level throughout the drawing operation. This tends to cool the central part of the molten bath, and renders the glass of more uniform consistency throughout the 'bath. It also produces a stronger chillin effect at or near the drawing point,-enabling the drawing to be carried out more rapidly,or enabling a thicker article td be drawn, if desired. Another advantage of this method of supplying the air is that the cold air supat the same level through-- drawing tool, and at substantially the same' lied near the level of the bath tends to orce the heated air inside the article toward its-upper portions, thus tending to annealthem and preventrapid cooling of tllie up 'r parts which would give hard ass. mg long-f cylinders, where the upper arts of the cylinder are lifted to a level fara ove the bath. Theuse of the cylinder and iston enables the supply tube to be quic y and easily withdrawn from the tool and the article, .while the apparatus is simple an not expensive. The use of the hand controlle outlet and. t e article is of advantage, as it prohis is of special advantage in drawbetween the graduating valve vides a constant small outlet. which is under the control. of the operator who can judge as to the proper areaot outlet to give the desired result. After he has turned this outlet valve to open it to the desired extent, the air is then under the -'control of the graduating valve, which automaticallyvaries the air supply as the drawing proceeds. I

Many changes may be made in the form and arrangement of the drawing apparatus,

thedepending sup l'yf-tub'e, the means for withdrawing the tu e and article-from each other, the hand controlled outlet, etc., without departing from my invention. I claim .1. The method ofdrawing hollow glass articles, consisting in attaching a drawing device to a bath of molten glass, drawing a hollow article upwardly therefrom, and

supplying air downwardly through the drawing device at substantially the same level relative to thebath durin ing 0 eration, substantially as 2. he method of drawing escribed. hollow glass articles, consisting in attaching a drawing the draw-- device to a bath of molten glass, drawin a hollow article upwardly therefrom, supp ing air through the drawing-device at subs stantially the same' evel relative to the bath during the drawing operation, and'continunusly permitting the air to escape -from within the article during the drawing thereof a ter the neck has been formed to re late the air pressure therein; substantia y as de cribed.

3. 'lhe method of drawing hollow glass articles, consisting in forming a neck, then enlarging and drawing the article upwardly from a bath of molten glass, su plying air to the interior of the article an opening a. small air outlet as the drawing of the article proceeds; substantially as described.

4. The method of forming glass articles consisting in drawing the hollow glass article upwardly from abath of molten glass,

supplying air to the same level within the article through the drawing. operation, an-

tomatically regulating the air supply to hold the article of the desired diameter and m drawing; substantially as described.

' articles, consisting in drawing a hollow i A 6. The method of forming hollow glass articles, consisting in drawing a hollow arriations thereof during drawing, substantially as described.

permitting a part of the air to escape dur- 5. The method of drawing hollow glass articles, consisting in drawin the glass upwardly from .a' bath of mo ten glass and supplying air downwardly upon the surface of the' bath within the article at the same level through the drawing operation, thus allowing the heatedair to rise within the article and assist in annealing its upper portions; substantially as described.

ticl from a glass bath, supplying air to the interior of the article during the drawing operation, and continuously regulating the an pressure within the article to prevent va-' 7. The method of forming hollow glass t e draw, and continuously regulating the.25

air pressure within the article to preventvariations in pressure therein during sald draw, substantiall as described.

8. In the metho of drawing hollowi'glass articles, the steps consisting'pf supplying air thereto during the drawing operation,- allowing the escape of said air,- and auto matical y scribed. I

In testimony whereof, l have hereunto set my ha'nd.

JOHN H..LUBBERS. Witnesses:

GEO. B. BLEMING, JOHN regulating the pressure within the article being drawn s'ubstantial lyias de- 

